Anchor rod tensioning construction device and construction method

Abstract

The invention discloses an anchor rod tensioning construction device. The device comprises a center hole jack; an anchor ring pressing end is formed at the front end of the center hole jack; a first through hole is formed in the anchor ring pressing end along the axial direction of the anchor ring pressing end; a second through hole is formed in the center hole jack along the axial direction of the center hole jack; the first through hole and the second through hole share the same axis; the lower end of one tensioning connection rod sequentially passes through the first through hole and the second through hole; a threaded hole is formed in the upper end surface of the tension connection rod; the periphery of a portion of the tensioning connection rod which is located in the first through hole, is sleeved with a spring; a portion of the tension connection rod, which is located in the first through hole and below the spring, is sleeved with a spring pressing end; and the lower end of thespring abuts against the spring pressing end. The invention also discloses an anchor rod tensioning construction method. According to the anchor rod tensioning construction device of the invention, the tensioning connection rod is in threaded connection with an anchor rod, and then, the anchor rod is tensioned, and therefore, a large axial pre-tightening force can be provided; and after the anchor rod is tensioned, the anchor rod is locked by a nut, and therefore, it can be ensured that the anchor rod will not lose a loading force, and the supporting and protection effect of the anchor rod can be improved.

Description

technical field [0001] The invention relates to the technical field of bolt construction. More specifically, the present invention relates to a bolt tensioning construction device and construction method. Background technique [0002] Bolting is the main form of bolting in my country, and the rate of bolting in key state-owned coal mines is close to 100%, which is one of the essential key technologies for high-yield and efficient production of coal mines. As the mining depth of coal mines increases, there are more and more difficult roadways. High-strength, high prestress, and strong support technologies are widely used in coal mines. During the construction process, a large axial force needs to be applied to the bolt. [0003] The production process of anchor rods commonly used in coal mines is to cut hot-rolled rebar into different lengths according to the requirements of use, the most commonly used is 2.4m, and then process it into a circle at one end of the rod body, wi...

AI Technical Summary

Problems solved by technology

There are two obvious deficiencies in applying a large torque to the anchor. 1. The torque cannot be well controlled during the construction process, and the pre-tightening force of the anchor is different; 2. The anchor is subjected to torsional shear stress during the tightening process. The actual stress is 1.3 times the axial pre-tightening stress of the anchor rod, which reduces the bearing capacity of the anchor rod and the anchor rod is easy to break

There are mainly three problems in the existing tension lock bolts: 1. After tensioning and locking, the axial pretension force of the bolt is small, which cannot meet the requirements of bolt support design; 2. After tensioning, The exposed length of the bolt cannot be well controlled, and the requirements for quality standardization cannot be met

3. After the initial tension, it can meet the higher pre-tightening force of the bolt support design, but during the working period of the bolt, the lock cannot lock the bolt, and the lock slides along the axial direction of the bolt, causing the bolt to lose load. The support effect is relatively poor

Moreover, when the existing anchor rod is stretched, there is a large gap between the anchor ring and the lock plate in the lockset (including the anchor ring and the lock plate), which causes the anchor rod to be unable to pre-tighten and increases the tension loss.

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